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From: Jan Engelhardt <jengelh@computergmbh.de>
To: Nikanth Karthikesan <knikanth@suse.de>
Cc: grant@torque.net, tim@cyberelk.net,
	Christoph Hellwig <hch@infradead.org>,
	Valdis.Kletnieks@vt.edu, linux-kernel@vger.kernel.org,
	kernel-janitors@vger.kernel.org
Subject: Re: [PATCH] Change paride driver to use unlocked_ioctl instead of ioctl
Date: Wed, 9 Jan 2008 13:14:25 +0100 (CET)	[thread overview]
Message-ID: <Pine.LNX.4.64.0801091313231.29244@fbirervta.pbzchgretzou.qr> (raw)
In-Reply-To: <1199955347.6203.6.camel@nikanth-laptop.blr.novell.com>


On Jan 10 2008 14:25, Nikanth Karthikesan wrote:
>-static int pt_ioctl(struct inode *inode, struct file *file,
>-	 unsigned int cmd, unsigned long arg)
>+static long pt_ioctl(struct file *file, unsigned int cmd,
>+		unsigned long arg)
> {
> 	struct pt_unit *tape = file->private_data;
> 	struct mtop __user *p = (void __user *)arg;
> 	struct mtop mtop;
>+	long err = 0;
>+
>+	lock_kernel();
> 
> 	switch (cmd) {
> 	case MTIOCTOP:
>-		if (copy_from_user(&mtop, p, sizeof(struct mtop)))
>-			return -EFAULT;
>+		if (copy_from_user(&mtop, p, sizeof(struct mtop))) {
>+			err = -EFAULT;
>+			break;
>+		}

I wonder why a simple copy_from_user() requires the BKL.. if pt
does need locking, then probably some mutex inside pt.


  reply	other threads:[~2008-01-09 12:14 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-10  6:14 Nikanth Karthikesan
2008-01-09  8:06 ` Christoph Hellwig
2008-01-09  8:23   ` Valdis.Kletnieks
     [not found]   ` <4784D3E0.BANGALORE.BLR.100.174746A.1.EABB.1@1:7.BANGALORE.BLR.100.0.1.0.1@16>
2008-01-10  8:55     ` Nikanth Karthikesan
2008-01-09 12:14       ` Jan Engelhardt [this message]
2008-01-09 12:20         ` Christoph Hellwig
2008-01-10  7:23 ` Nikanth Karthikesan
2008-01-09 12:33   ` Matthew Wilcox
2008-01-09 13:26     ` Jiri Kosina
2008-01-09 16:56       ` Alan Cox
2008-01-10 15:01         ` Jiri Kosina
2008-01-10 20:58           ` Alan Cox
     [not found]         ` <478681FE.BANGALORE.BLR.100.174746A.1.ECB1.1@1:7.BANGALORE.BLR.100.0.1.0.1@16>
2008-01-10 15:31           ` Nikanth Karthikesan
2008-01-10 15:50             ` Matthew Wilcox
     [not found]       ` <47854BF3.BANGALORE.BLR.100.174746A.1.EB89.1@1:7.BANGALORE.BLR.100.0.1.0.1@16>
2008-01-10  5:29         ` Nikanth Karthikesan

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